<!DOCTYPE html>
<html>
<head> 
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>{{title}}</title>
    <link href="https://cdn.bootcss.com/twitter-bootstrap/4.1.3/css/bootstrap.css" rel="stylesheet" type="text/css">
    
</head>
<body>

    {% block body %}{% endblock %}
    {% block extra %}
        <script type="text/javascript" src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
        <script type="text/javascript" src="https://cdn.bootcss.com/twitter-bootstrap/4.1.3/js/bootstrap.bundle.js"></script>
    {% endblock %}
</body>

</html>